Add manual selection of rsync options

Check that the inputs specified on the command line (i.e. with the
option '-i' or '--input') exist and print a warning when they don't.
If no valid inputs are found, exit.

man/simple_backup.1

@@ -59,6 +59,25 @@ Default behavior is to remove old backups after successfully completing the back
 .TP
 .B \-\-no\-syslog
 Don't use systemd journal for logging
+.TP
+.B \-\-rsync\-options OPTIONS [OPTION...]
+By default, the following rsync options are used:
+.RS
+.PP
+\-a \-r \-c \-v \-h \-H \-X
+.PP
+Using \-\-rsync\-options it is possible to manually select which options to use. Supported values are the following:
+.PP
+\-a, \-l, \-p, \-t, \-g, \-o, \-c, \-h, \-D, \-H, \-X
+.PP
+Options \-r and \-v are used in any case. Not that options must be specified without dash (\-), for example:
+.PP
+.EX
+simple_backup \-\-rsync\-options a l p
+.EE
+.TP
+Check rsync(1) for details about the options.
+.RE
 .SH CONFIGURATION
 An example configuration file is provided at \(aq/etc/simple_backup/simple_backup.conf\(aq. Copy it to the default location
 ($HOME/.config/simple_backup) and edit it as needed.

simple_backup/__init__.py

@@ -1,3 +1,3 @@
 """Init."""
 
-__version__ = '3.4.0'
+__version__ = '3.5.0'

simple_backup/simple_backup.py

@@ -186,12 +186,28 @@ class Backup:
         self.create_backup_dir()
 
         _, self._inputs_path = mkstemp(prefix='tmp_inputs', text=True)
-        _, self._exclude_path = mkstemp(prefix='tmp_exclude', text=True)
+        count = 0
 
         with open(self._inputs_path, 'w') as fp:
             for i in self.inputs:
+                if not os.path.exists(i):
+                    logger.warning(f'Input {i} not found. Skipping')
+                else:
                     fp.write(i)
                     fp.write('\n')
+                    count += 1
+
+        if count == 0:
+            logger.info('No existing files or directories specified for backup. Nothing to do')
+
+            try:
+                notify('Backup finished. No files copied')
+            except NameError:
+                pass
+
+            return 1
+
+        _, self._exclude_path = mkstemp(prefix='tmp_exclude', text=True)
 
         with open(self._exclude_path, 'w') as fp:
             if self.exclude is not None:
@@ -267,6 +283,9 @@ def _parse_arguments():
     parser.add_argument('--remove-before-backup', action='store_true',
                         help='Remove old backups before executing the backup, instead of after')
     parser.add_argument('--no-syslog', action='store_true', help='Disable systemd journal logging')
+    parser.add_argument('--rsync-options', nargs='+',
+                        choices=['a', 'l', 'p', 't', 'g', 'o', 'c', 'h', 'D', 'H', 'X'],
+                        help='Specify options for rsync')
 
     args = parser.parse_args()
 
@@ -353,12 +372,21 @@ def simple_backup():
     if args.keep is not None:
         keep = args.keep
 
+    if args.rsync_options is None:
         if args.checksum:
-        backup_options = '-arcvh -H -X'
+            rsync_options = '-arcvh -H -X'
         else:
-        backup_options = '-arvh -H -X'
+            rsync_options = '-arvh -H -X'
+    else:
+        rsync_options = '-r -v '
 
-    backup = Backup(inputs, output, exclude, keep, backup_options, remove_before=args.remove_before_backup)
+        for ro in args.rsync_options:
+            rsync_options = rsync_options + f'-{ro} '
+
+        if '-c ' not in rsync_options and args.checksum:
+            rsync_options = rsync_options + '-c'
+
+    backup = Backup(inputs, output, exclude, keep, rsync_options, remove_before=args.remove_before_backup)
 
     return_code = backup.check_params()